I am not of the military ilk so please forgive me if the terminology is wrong regarding this question.
I once saw a picture taken from the inside of a modern tank which showed the breech open between loading rounds and it was possible to see up the barrel and to the outside.
I was wondering if it is the case when reloading there is a period between rounds that it would be possible for an extraordinarily lucky shot to enter the barrel and the interior of the tank? How would this work on a heavily NBC contaminated battlefield, surely if a tank is ‘buttoned up’ nothing can get in?
With all the lead flying around on a battlefield has this ever happened?
It would be particularily ironic if another tank got a shot down the barrel at this point (as in the Hollywood movie trope where a sniper shoots an enemy sniper down the scope of his rifle).
Need answer fast!